BETA freeCodeCamp -ES6: Write Higher Order Arrow Functions- Trouble [16, 1764, 36] [SOLVED][SPOILER]

1

Hello, i have trouble with this rule:
squaredIntegers should be [16, 1764, 36]

Link: https://beta.freecodecamp.org/en/challenges/es6/write-higher-order-arrow-functions

My code:


"use strict";

const realNumberArray = [ 4, 5.6, -9.8, 3.14, 42, 6, 8.34 ];
let squaredIntegers = realNumberArray.filter((squareSupZero) => squareSupZero >= 0 );
squaredIntegers = realNumberArray.map((squareSupZero) => squareSupZero >=0 );

console.log( squaredIntegers );

It’s maybe a bug with the “const”… I tried changing it to let and even var but i have the same error.

Have a nice day.

ps: if you think it would be better to go to the chat room and ask, tell me !

1 Like
4

Hello, i really thanks you for your help.
I miss readed the exercice. I didn’t see “to compute the square”. And i think using the term ‘float’ would be better than “fractions are not integers”. More direct and easy to understand for foreigners (my thought).

By looking over internet how to identify float from integer, i used this ( x % 1 === 0):

"use strict";

const realNumberArray = [ 4, 5.6, -9.8, 3.14, 42, 6, 8.34 ];
let squaredIntegers = realNumberArray.filter((integer) => integer % 1 === 0 );

squaredIntegers = squaredIntegers.map((square) => square*square );

console.log( squaredIntegers );

Is there a better way to do it directly ? like with Filter itself ? or other already made function ?

Thanks you again.

2 Likes
6

Ok, thanks you ! The use of [] is very special.

1 Like
8

Ah yes of course :slight_smile: Nicely done.

9

where is the chat room. i’m new here

10
11

I did it this way, but it wants the squaredIntegers to be a const… How would I go about making squaredIntegers a const?

const realNumberArray = [4, 5.6, -9.8, 3.14, 42, 6, 8.34];
const squareList = (arr) => {
  "use strict";
  // change code below this line
  let squaredIntegers = arr.filter(num => Number.isInteger(num));
  
  squaredIntegers = squaredIntegers.map(square => square*square);
  
  // change code above this line
  return squaredIntegers;
};
// test your code
const squaredIntegers = squareList(realNumberArray);
console.log(squaredIntegers);
3 Likes
12

Figured it out after a bit of reading. Just had to go straight into the .map function.

const realNumberArray = [4, 5.6, -9.8, 3.14, 42, 6, 8.34];
const squareList = (arr) => {
  "use strict";
  // change code below this line

  
  const squaredIntegers = arr.filter(num => Number.isInteger(num)).map(square => square*square);
  
  // change code above this line
  return squaredIntegers;
};
// test your code
const squaredIntegers = squareList(realNumberArray);
console.log(squaredIntegers);
10 Likes
13

Thats how I solved it too!

14

a similar solution :slight_smile:

const realNumberArray = [4, 5.6, -9.8, 3.14, 42, 6, 8.34];
const squareList = (arr) => {
  "use strict";
  // change code below this line
  const squaredIntegers = [];
  arr.map( num => {
    if(Number.isInteger(num)){
       squaredIntegers.push(num * num);
    }
  })
  // change code above this line
  return squaredIntegers;
};
// test your code
const squaredIntegers = squareList(realNumberArray);
console.log(squaredIntegers);
3 Likes